Hi,
suppose you have the following line at your crontab :
5 * * * * /usr/mine/script > /dev/null 2>&1
now i understood that the " > /dev/null 2>&1 outputs both Standard outpout and Standard Error messages to the /dev/null device or file...
the first part , " > /dev/null " transfers... (1 Reply)
First of all, hello there cOmMuNity ! :cool:
Well, I've got two basic questions:
1) In how many ways it's possible to create a file ?
I know one manner using "touch", other typing something like echo "" > file ...
The fact is that I need to overwrite the file if it exists, and touch... (8 Replies)
when i write the following two statements :
cp /dev/NULL /clocal/mqbrkrs/user/mqsiadm/sanjay/dspmq_temp
cat /dev/NULL > /clocal/mqbrkrs/user/mqsiadm/sanjay/dspmq_temp
its gives me errors like :
cp: /dev/NULL: A file or directory in the path name does not exist.
cat : /dev/NULL can't open... (2 Replies)
Hi, Anyone can help
My solaris 8 system has the following
/dev/null , /dev/tty and /dev/console
All permission are lrwxrwxrwx
Can this be change to a non-world write ??
any impact ?? (12 Replies)
Hi,
I am new into UNIX shell scripting and I am wondering what is the meaning of the below text which appears at the end of each line in the ".sh" file:
> /dev/null 2>&1
For example, the line below:
sh $HOME/stats/Rep777/Act_777.sh omc omc > /dev/null 2>&1
I know for sure what "sh... (10 Replies)
How are these two different? They both prevent output and error from being displayed. I don't see the use of the "&"
echo "hello" > /dev/null 2>&1
echo "hello" > /dev/null 2>1 (3 Replies)
Hi,
I'm currently using the following command to wipe clean a log file which can't be straight out RM'd:
cat /dev/null > server.log
I'm building this into a script and I'm current working on a command to run on each machine to do this automatically however I have multiple files so I need... (11 Replies)
I apologize if this question has been answered else where or is too elementary.
I ran across a KSH script (long unimportant story) that does this:
if ; then
CAS_SRC_LOG="/var/log/cas_src.log 2>&1"
else
CAS_SRC_LOG="/dev/null 2>&1"
fithen does this:
/usr/bin/echo "heartbeat:... (5 Replies)
Hello,
Does anyone know how to housekeeping the null 2>&1 file in /dev?
its fill up my system, please help.
Thanks :b: (3 Replies)
Discussion started by: only
3 Replies
LEARN ABOUT LINUX
mkdevalloc
mkdevalloc(1M) System Administration Commands mkdevalloc(1M)NAME
mkdevalloc - Make device_allocate entries
SYNOPSIS
/usr/sbin/mkdevalloc
DESCRIPTION
The mkdevalloc command writes to standard out a set of device_allocate(4) entries describing the system's frame buffer, audio and removable
media devices.
The mkdevalloc command is used by the init.d(4) scripts to create or update the /etc/security/device_allocate file.
Entries are generated based on the device special files found in /dev. For the different categories of devices, the mkdevalloc command
checks for the following files under /dev:
audio /dev/audio, /dev/audioctl, /dev/sound/...
tape /dev/rst*, /dev/nrst*, /dev/rmt/...
floppy /dev/diskette, /dev/fd*, /dev/rdiskette, /dev/rfd*
removable disk /dev/sr*, /dev/nsr*, /dev/dsk/c0t?d0s?, /dev/rdsk/c0t?d0s?
frame buffer /dev/fb
All entries set the device-minimum and device-maximum fields to the hex representations of ADMIN_LOW and ADMIN_HIGH, respectively. The
device-authorization field is set to solaris.device.allocate, except for the framebuffer entry, where it is set to *. The device-name,
device-type and device-clean fields are set to the following values:
device-name device-type device-clean
audio audio audio audio_clean_wrapper
tape mag_tape_0,1,... st st_clean
floppy floppy_0,1,... fd disk_clean
removable disk cdrom_0,1,... sr disk_clean
frame buffer framebuffer fb /bin/true
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|Interface Stability |Obsolete |
+-----------------------------+-----------------------------+
SEE ALSO allocate(1), bsmconv(1M), attributes(5)NOTES
mkdevalloc might not be supported in a future release of the Solaris operating system.
SunOS 5.10 8 Oct 2003 mkdevalloc(1M)